TEGO® RenewHA Mandelic is an aromatic alpha hydroxy acid (AHA). Although originally derived from amygdalin, an extract from almonds, most mandelic acid today is synthetically produced.Because of its larger molecular structure relative to other AHAs like glycolic acid, mandelic acid is known to have slower penetration into the skin, which in part moderates its irritation potential to the skin. By implication, the speed of action from a mandelic acid application may be slower or more gradual than some other AHA acids, and its use may be more appropriate for sensitive skin applications.Mandelic acid has been found useful to improve various skin conditions including UV-driven lentigenes, darkening of skin seen with melasma, inflammatory acne, wrinkles, and fine lines.